Lock.



. Patented Apr. I5, i902.v C. W. BARRETT. f

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(No Model.)

(Application filed June 13, 1601.)

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No. 697,599. Pa'ten'fedfApr. I5, |902.

C. W. BARRETT.

LUCK.

(Application 1ed June 13, 1901.) (No Model.) 2 Sheets-Sheet 2.

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UNITED STATES PATENT' OFFICE.

CHARLES WV. BARRETT, OF RALEIGH, NORTH CAROLINA.

LOCK.

SPECIFICATION forming part ofv Letters Patent No. 697,599, dated April15, 1902.

' Application filed .Tune 13, 1901.

T0 all whom, it ncy concern:

Be it known that I, CHARLES W. BARRETT, a citizen of the United States,residing at Raleigh, in the county of Wake and State of North Carolina,have invented certain new and useful'lmprovements in Mortise-Locks forDoors; and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to improvements in mortise-locks for doors.

The object of the invention is to provide a mortise-lock which issimple, cheap, and durable in construction, effective in operation, andadapted to occupy a mortise of such form as to be easily and quicklymade and of such size as to not materially affect thev strength of thedoor.

With this and other objects -in View the invention consists of certainnovel features of construction, combination, and arrangement of parts,as will be hereinafter more fully described, andparticularly pointed outin the appended claim.

In the accompanying drawings, Figure lis a fragmentary elevational viewof the edge of a door, showing the manner of forming the mortisetherein. Fig. 2 is asimilar view show,- ing the lock applied, theface-plate being broken away to expose the casing, which appears intransverse section. Fig. 3 is a front side elevation of the lockdetached. Fig. 4 is an interior view of the lock, the removablecasing-section being detached, showing the normal position of the parts.Fig. 5 is a similar view showing the latch-bolt retracted by itstumbler-block. Fig. 6 is a fragmentary interior view similar to Figs. 4and 5, showing the latch-bolt held projected by the keybolt. Fig. 7 is across-section through the lock on line 7 7 of Fig. 4. Fig. 8 is acrosssection through the lock on line 8 8 of Fig. 4. Fig. 9 is a detailView of the tumbler-block, and Fig. l0 isa similar'view of one of thesections of the key-bolt.

It is a well-known fact that mortise-locks of theconstruction now incommon use are unnecessarily complicated and costly and alsounnecessarily. large, making necessary the cutting away of a large partof the door-stile Serial No. 64,413. (No model.)

at the proper point to allow of the insertion and use of the lock, thusmaterially weakening the door and adding to the cost of applying thelock thereto. Myinvention is designed to obviate this objection by thepro- I vision of a lock which is adapted to occupy a comparatively smalland easily-formed mortise and is simple and cheap in construction andnot liable to get out of order.

In forming the mortise for the reception of my improved lock, as shownin Fig. l, two auger-holes l and 2 of the required size are made oneabove the other in the face of the door-stile 3 and the intermediatesolid portion 4 between them cut away as far as the dotted lines, thusforming a mortise having fiat parallel side walls and curved top andbottom walls. This form of mortise is much more readily and quickly madethan mortises of ordinary construction, and as it covers less space thanthe latter weakens the door to a materiallyless extent. The cost ofpreparing the door for the reception of the lock is furthermore greatlyreduced, and the work can be much more expeditiously performed.

In carrying my invention into practice I provide alock-casing conformingto the shape or configuration' of the mortise, such casing having liatside walls and curved or rounded top and bottom walls and longitudinallydivided to form two sections 5 and 6. The section 5 is rigidly connectedto or cast integrally with the faceplate-7, while the section 6 isvremovable and is adapted to be connected to the section 5 by means of ascrew 8, passed through said sections at their rear ends, and by meansof a tongue" 9, formed upon the front end of said section 6 and adaptedto enter a socket or mortise l0 in the face-plate 7, as shown in brokenlines in Fig. 3. When it is desired to detach the section 6, the screw 8is removed and said section then disconnected from the face-plate bysliding it rearwardly to withdraw the tongue 9 from engagement with thesocket or mortise l0. The lo ck-casing is comparatively long and narrow,so as to obviate the necessity' of vweakening the door-stile by theformation of a wide mortise.

In the outer or front portion of the casing is mounted the latch-bolt11, which is provided with a flat body portion l2, having a slot orchamber' 13, the top and bottom walls of which are provided withinwardly-extending oppositely-disposed lugs 14 and 15. In the rear ofthese lugs is arranged a protracting-spring 16, consisting of two partsor sections secured at their meeting ends by a pin 17 to a block oriixed part 18 of the casing and thence curving forwardly and bearingagainst the said lugs 14 and 15. This spring occupies the rear portionof the chamber and serves to project the latch-bolt and to normally holdit in projected or locking position. The knob-shaft 19 has connectedtherewith a trefoliate tumbler-block 20, which occupies the outer orfront portion of the chamber 13, with its main or central point, towhich said shaft is connected, curved or rounded and adapted to normallyoccupy the space between the lugs 14 and 15. The other points or arms ofthis block project upwardly and downwardly and carry bumpers orcontactpieces 21 and 22, which are adapted to abut against the lugs 14and 15. These bumpers are preferably made of hard rubber or some othersuitable non-resonant material, so as to make the operation of thetumbler-block practically noiseless in retracting the latchbolt againstthe tension of the spring. By the described construction of the block itwill be seen that upon turning the shaft 19 in one direction or theother either the contact-piece 21 will come into engagement with the lug14 or the contact-piece 22 will come into engagement with the lng 15 andas the block swings will retract the latch-bolt against the tension ofthe spring 16, as clearly indicated in Fig. 5. The block 2O is formedwith suitable trunnions 23, which are mounted to turn in open bearings24, formed in the side walls of the casing-sections 5 and 6.

The latch-bolt is held projected to maintain the door locked by akey-tumbler and keybolt located in the rear of the casing.- Thekey-tumbler 25 is provided with journals 26, mounted in open bearings27, formed in the side walls of the casing to allow said tumbler to havea rotary movement, and is formed with a suitable slot for the receptionof the key. The key-bolt 28 is carried by the tumbler and comprises abolt proper and a collar 29 to embrace the tumbler, which collar tswithin an annular groove formed in the tumbler. To adapt the key-bolt tobe readily applied and removed and to be tightened or loosened, asdesired, I preferably form the same of two corresponding parts orsections 30 and 31, connected together by a screw 32, which holds saidsections adjustably and loosely connected to the key-tumbler, so thatthe latter may turn as freely as desired therein. By means of the screw32 the two sections of the key-bolt may be adjusted to compensate forwear and to iit with a greater or less degree of looseness upon thetumbler, as may be found necessary or desirable. The tumbler is adaptedto be rotated through the instrumentality of a key fitted within theslot therein, and in order to adapt the same to have a certain amount ofindependent movement and to operate the key-bolt when turned to theproper position I provide said tumbler with a contact-lug 33, which isadapted to engage a pin 34 on the key-bolt. By this conlstruction whenthe tumbler is turned in one direction the lug is brought into contactwith the pin 34 to move the key-bolt from the vertical position, whichit normally occupies, to the horizontal position (shown in Fig. 6) tohold the latch-bolt 11 projected and at the same time to prevent turningof the knobshaft 19 and tumbler-block 20. Upon turning the tumbler inthe reverse direction it is adapted to have nearly one completerevolution before bringing the lug 33 again into engagement with the pin34, and at this time said lug will bear against the under side of saidpin, and a continued movement of the tumbler 25 will restore thekey-bolt to its normal position (shown in Figs. 4 and 5) and permit thelatch-bolt 11 to be retracted by the movement of the tumbler-block 20.In order to provide the necessary resistance to the movement of thekey-tumbler 25 to prevent its too free operation andjto maintain it inlookin g and unlocking position, I employa detent-spring 35, which ismounted upon the screw 8 and is adapted to engage recesses orindentations 36, formed at diametrically opposite points in theperiphery of the tumbler, so that when the tumbler is turned to eitherof the aforesaid positions the spring Will seat in one of saidindentations and oppose a resistance to the movement of the tumbler andkey-bolt, which resistance may be, however, overcome by the insertion ofthe proper key within the key-slot within the tumbler to turn the samein the proper direction to bring the lug 32 in one or the other of itsproper operative positions. The key-bolt is limited in its downwardmovement and held from being turned beyond the vertical in one directionand beyond the horizontal in the other direction by means of astop-block 37, fixed upon the rear end wall of the casing, whichstop-block is made of some suitable sounddeadening material, so as tomake the operation of the key-bolt practically noiseless.

From the foregoing description, taken in connection with theaccompanying drawings, the construction, mode of operation, andadvantages of the invention will be readily understood, and it will beseen that it provides a lock which is simple of construction, adapted tobe iitted within a comparatively small mortise, and embodies a number ofdesirable and advantageous features due to its peculiarconstructionalone.

Vhile the preferred embodiment of the invention is as herein disclosed,it will of course be understood that changes in the form, proportion,and minor details of construction may be made Within the scope of theinvention without departing from the spirit or sacrificing any of theadvantages thereof.

IOO

Ifo

Having thusfully described my invention, what I claim as new, and desireto secure by Letters Patent, is-

In a mortise-lock, the combination with a casing; of a latch-bolt havingabody portion formed with a slot, the Walls of Which are providedintermediate theirends Withopposite, inwardly-extending lugs, a supportupon the casing projecting into the slot, a protractingspring occupyingthe rear portion of the slot and secured to said support and havingforwardly-curved ends bearing against said lugs, an annularly-groovedkey-tumbler, a rotary key-bolt having a collar loosely fitting theygroove in the key-tumbler, said bolt and collar being longitudinallydivided, forming corresponding sections, means for adj ustably securingsaid sections together to regulate the frictional engagement ot thecollar With limiting the extent ofrotation of said key tumbler,substantiallyy as set forth.

In testimony whereof I havefhereunto set my hand inpresence of tWosubscribing Wit nesses.

CHARLES. W. BARRETT. I

Witnesses:

W.A M. Russ, F. K.-THoMsoN.A

